// T5DE's client releases, from git.t5de.dev's API (the t5de repository's releases, which its CI publishes). Pages
// using them are regenerated every few minutes; if Gitea can't be reached, they link to its releases page instead.

const repo = "https://git.t5de.dev/api/v1/repos/t5de/t5de";
export const releasesPage = "https://git.t5de.dev/t5de/t5de/releases";
const revalidate = 300;

export type Release = {
  tag: string;
  version: string;
  date: string;
  nightly: boolean;
  url: string;
  body: string;
  setup: { url: string; size: number } | null;
  sha256: string | null;
  imvu: string | null;
};

type GiteaRelease = {
  tag_name: string;
  name: string;
  body: string;
  prerelease: boolean;
  draft: boolean;
  published_at: string;
  html_url: string;
  assets: { name: string; size: number; browser_download_url: string }[];
};

function parse(r: GiteaRelease): Release {
  const nightly = r.tag_name === "nightly";
  const setup = r.assets.find((a) => a.name === "T5DE-Setup.exe");
  return {
    tag: r.tag_name,
    // Releases are tagged vX.Y.Z; the nightly's version is in its name ("Nightly <version>").
    version: nightly ? r.name.replace(/^Nightly\s+/, "") : r.tag_name.replace(/^v/, ""),
    date: r.published_at,
    nightly,
    url: r.html_url,
    body: r.body,
    setup: setup ? { url: setup.browser_download_url, size: setup.size } : null,
    sha256: /`T5DE-Setup\.exe` sha256: `([0-9a-f]{64})`/.exec(r.body)?.[1] ?? null,
    imvu: /IMVU Classic \*\*([\d.]+)\*\*/.exec(r.body)?.[1] ?? null,
  };
}

async function get<T>(path: string): Promise<T | null> {
  try {
    const res = await fetch(repo + path, { next: { revalidate } });
    return res.ok ? ((await res.json()) as T) : null;
  } catch {
    return null;
  }
}

/** The latest release (not the nightly), or null. */
export async function latestRelease(): Promise<Release | null> {
  const r = await get<GiteaRelease>("/releases/latest");
  return r ? parse(r) : null;
}

/** The current nightly build, or null. */
export async function nightlyRelease(): Promise<Release | null> {
  const r = await get<GiteaRelease>("/releases/tags/nightly");
  return r ? parse(r) : null;
}

/** Every release, newest first, without the nightly; null if Gitea can't be reached. */
export async function allReleases(): Promise<Release[] | null> {
  const rs = await get<GiteaRelease[]>("/releases?limit=50&pre-release=false&draft=false");
  return rs ? rs.filter((r) => r.tag_name !== "nightly" && !r.draft).map(parse) : null;
}

export function formatSize(bytes: number): string {
  return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
}

export function formatDate(iso: string): string {
  return new Date(iso).toLocaleDateString("en-US", { year: "numeric", month: "short", day: "numeric", timeZone: "UTC" });
}